Coerce a single value, array, or nullish into an array: nullish → [], an array is
returned as-is, and a scalar is wrapped as [value].
Complements arrayOrEmpty (which only normalizes an already-array-or-nullish
value) for the common "wrap a maybe-present value for an array-typed prop" case.
Coerce a single value, array, or nullish into an array: nullish →
[], an array is returned as-is, and a scalar is wrapped as[value].Complements arrayOrEmpty (which only normalizes an already-array-or-nullish value) for the common "wrap a maybe-present value for an array-typed prop" case.